Add custom css to admin dashboard

resources/views/admin/settings/customcss.blade.php

@@ -0,0 +1,45 @@
+@extends('admin.partial.template-full')
+
+@section('section')
+</div>
+<div class="header bg-primary pb-3 mt-n4">
+    <div class="container-fluid">
+        <div class="header-body">
+            <div class="row align-items-center py-4">
+                <div class="col-lg-6 col-7">
+                    <p class="display-1 text-white d-inline-block mb-0">Custom CSS</p>
+                    <p class="lead mb-0 text-white">Customize your instance with custom css.</p>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+<div class="container-fluid mt-4">
+    <div class="col-12 col-md-6">
+        <form method="post">
+            @csrf
+            <div class="form-group">
+                <div class="custom-control custom-checkbox">
+                    <input
+                        type="checkbox"
+                        name="show"
+                        class="custom-control-input"
+                        id="customCheck1"
+                        {{ (bool) config_cache('uikit.show_custom.css') ? 'checked' : null}}
+                    >
+                    <label class="custom-control-label" for="customCheck1">Enable Custom CSS</label>
+                </div>
+            </div>
+            <div class="form-group">
+                <label for="css" class="font-weight-bold">Custom CSS</label>
+                <textarea
+                    class="form-control"
+                    id="css"
+                    name="css"
+                    rows="5">{!!config_cache('uikit.custom.css')!!}</textarea>
+            </div>
+            <button class="btn btn-primary">Save</button>
+        </form>
+    </div>
+</div>
+@endsection

routes/web-admin.php

@@ -3,6 +3,8 @@
 Route::domain(config('pixelfed.domain.admin'))->prefix('i/admin')->group(function () {
     Route::redirect('/', '/dashboard');
     Route::redirect('timeline', config('app.url').'/timeline');
+    Route::get('settings/custom-css', 'AdminController@customCss')->name('admin.custom-css');
+    Route::post('settings/custom-css', 'AdminController@saveCustomCss');
     Route::get('dashboard', 'AdminController@home')->name('admin.home');
     Route::get('stats', 'AdminController@stats')->name('admin.stats');
     Route::get('reports', 'AdminController@reports')->name('admin.reports');